TO DO List：
- Jan.31 Module1 Modeling via Differential Equations
- Feb.4 Module2 What is A Differential Equations
- Feb.6 Module3 Separation of Variables - An Analytic Technique
- Feb.8 Module4 Slope Fields — A Geometric and Qualitative Technique
- Feb.10 Module5 Euler's Method — A Numerical Technique
- Feb.13 Module6 Existence and Uniqueness of Solutions
- Feb.15 Module7 Autonomous Equations and their Phase Lines
- Feb.20 Module8 Bifurcations
- Feb.21 Module9 Linear Differential Equations
- Feb.28 Module10 Systems of Differential Equations
- Mar.07 Module11 Vector Fields, Direction Fields, Phase Plane
- Mar.08 Module12 Damped Harmonic Oscillation
- Mar.13 Module13 Analytic Methods for Special Systems
- Mar.13 Module14 Euler's Method for Systems
- Mar.20 Module15 Existence and Uniqueness Theory for Systems
- Mar.20 Module16 The SIR Model of an Epidemic
- May.5 Module1 Linear Systems and the Linearity Principle